The reference is a local order book, not a global average
Rates on this site are drawn from VALR and Luno order books through a cached
edge endpoint, and the calculator alongside uses the same source. That choice is deliberate
and it is the single most important thing on this page. It is how the desk prices the ZAR
book, and the same discipline applies to every corridor it quotes: price against the venue
that will actually absorb the trade, never against a global index.
The naive way to price a ZAR trade is to take the global dollar price of the asset from an
international feed and multiply it by the USD/ZAR spot rate. Almost every generic calculator
on the internet does exactly this. It is wrong in South Africa, and it is wrong in a
consistent direction.
South African crypto markets carry a persistent premium over global price ×
USD/ZAR. The reason is structural, not sentiment: closing the gap requires an arbitrageur to
move value across the border in both directions, and exchange control makes that slow,
capped and paperwork-heavy. Financial Surveillance will not approve a cross-border transfer
for the purpose of purchasing crypto assets, so the usual arbitrage channel does not exist in
the form it takes in unrestricted markets. The gap therefore does not close cleanly. It
widens when demand for offshore exposure rises and narrows when it falls, and on rare
occasions it inverts into a discount.
Quoting a large ticket off a global feed misprices it, in a way that gets more expensive the
bigger the trade. If you are selling, a global-feed quote systematically underpays you
against the market you are actually selling into. If you are buying, it flatters the price
you think you are getting and the difference reappears at settlement. Every market has its
own version of this — a local premium, a local discount, a rail that only clears on business
days — which is why the corridor is confirmed before a quote rather than assumed.
Depth at your size, not the headline price
The mid price on a screen is the midpoint of the best bid and the best offer. It describes
the price of a very small trade. What matters for your ticket is how much volume sits behind
that price. A trader prices from the depth that would have to be consumed to fill your amount
across the venues and counterparties available, which is why the quote for R5 million is not
simply five times the quote for R1 million. Depth is set out in more detail on the
large-volume trades page.